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大麻素激动剂WIN 55,212-2对脊髓损伤大鼠的抗伤害感受作用。

Antinociceptive effect of cannabinoid agonist WIN 55,212-2 in rats with a spinal cord injury.

作者信息

Hama Aldric, Sagen Jacqueline

机构信息

University of Miami Miller School of Medicine, The Miami Project to Cure Paralysis, 1095 NW 14th Terrace (R-48), Miami, FL 33136, USA.

出版信息

Exp Neurol. 2007 Mar;204(1):454-7. doi: 10.1016/j.expneurol.2006.09.002. Epub 2006 Oct 11.

Abstract

Spinal cord injury (SCI) pain exhibits many symptoms associated with peripheral neuropathic pain, including increased tactile hypersensitivity. One novel approach to ameliorate SCI pain is the use of cannabinoid (CB) ligands. The current study evaluated the efficacy of the nonselective CB receptor agonist WIN 55,212-2 on tactile hypersensitivity in rats following a brief compression to the thoracic spinal cord. The withdrawal thresholds of the hind paws following SCI were significantly decreased, indicating tactile hypersensitivity. Systemic injection of WIN 55,212-2 increased withdrawal thresholds in a dose-dependent manner. Pretreatment with the CB(1) receptor subtype-selective antagonist AM 251 completely abolished the antinociceptive effect of WIN 55,212-2 whereas pretreatment with the CB(2) receptor subtype-selective antagonist AM 630 did not alter the antinociceptive effect of WIN 55,212-2. These data indicate that a CB(1)-selective agonist may be novel therapeutic treatment for clinical SCI pain.

摘要

脊髓损伤(SCI)疼痛表现出许多与周围神经性疼痛相关的症状,包括触觉超敏反应增强。一种改善SCI疼痛的新方法是使用大麻素(CB)配体。本研究评估了非选择性CB受体激动剂WIN 55,212-2对大鼠胸段脊髓短暂压迫后触觉超敏反应的疗效。SCI后后爪的撤足阈值显著降低,表明存在触觉超敏反应。全身注射WIN 55,212-2以剂量依赖性方式提高撤足阈值。用CB1受体亚型选择性拮抗剂AM 251预处理可完全消除WIN 55,212-2的抗伤害感受作用,而用CB2受体亚型选择性拮抗剂AM 630预处理则不会改变WIN 55,212-2的抗伤害感受作用。这些数据表明,CB1选择性激动剂可能是临床SCI疼痛的新型治疗方法。

https://cdn.ncbi.nlm.nih.gov/pmc/blobs/d50b/1861843/7b15099fec38/nihms20062f1.jpg

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